Process and composition for coloring organic derivatives of cellulose



Patented Aug. rest taint r one PRUCIESS AND COMPOSII'EKON FQR COLOR- ITNG @RGANHC DERIVATIVES 01F CELLU- lLQSIE Simon 'lihornson McQueen and Alexander Stewart, lBlaclrley, Manchester, England, assignors to llmperial Chemical industries Limited, a corporation oil Great Britain No Drawing. Application March 9, 1933, Serial 4 Claims.

ters or ethers the colour value of the dyestuff is considerably enhanced. This means that ac cording to our present process with a given amount of colour there can be produced, e. g. on acetate sillr, a greater depth of shade than when the addition of glycerol ether as prescribed by us is omitted.

As examples or" ethers of polyhydroxy alcohols 53% which we may employ we mention the mono and di-o-tolylethers of glycerine or glycol, the di-mi tolyl ether, the monoand di-phenyl ethers and the dibenzyl ether but we do not confine ourselves to the use of these ethers.

When speaking of the monoethers of glycerine we mean either the alphaor beta-ethers or a mixture of both; and with respect to the diethers, these include the alphabeta or alpha-gamma or mixtures of both.

These ethers, although immiscible with water,

may be added to the printing paste in their original form or in the form of an aqueous emulsion. In dyeing, While not absolutely necessary, it is preferable to use an aqueous emulsion of the chosen ether.

The ether or ether emulsion may also be incorporated with the dyestufl paste previous to the addition of the latter to the printing paste or dyebath and in this way a composition of matter is obtained which is very suitable for use in carrying out our invention. Provided suflicient ether is employed in the dyestuff paste, the use of such a composition renders it unnecessary to make separate additions of ether to the printing paste or dyebath.

In printing according to the process of the present invention not only is the depth of shade increased as compared with what is obtainable without the addition of a polyhydroxy ether; but the time of steaming'required to fix the colour and develop the shade is also reduced as compared with the time required in the absence ofsuch an ether. I

The preparation of a. polyhydroxy ether emul lln Great Britain March 11,

slon may be carried out as illustrated in the following example, in which the parts are by weight.

Example I A solution is prepared by mixing together 4.5 parts of an aqueous gum Senegal solution, 3.0 parts of stearic acid, 7.5 parts of concentrated ammonia (Sp. gr.:=0.880) and Q83 parts of water.

Into this solution there are added in a slow stream and with vigorous stirring 45 parts of glycerol di-o-tolyl ether, the stirring being continued after the addition until a uniform emulsion is obtained. r,

The following examples illustrate typical printing pastes according to this invention but without limiting the same. The parts are by weight.

Example It A printing paste is prepared in known manner from the following ingredients:

Parts 1,4-dirnethylamino-anthraquinone in paste form 12 25 Dark British gum thickening (50%) 62.8 Soluble oil 3.0 Glycerine 1.0 Glycerol-di-o-tolyl ether emulsion (41%)-" 21.2

Acetate silk material is printed with the above paste, dried, steamed for 5 minutes at 101-l02 C., rinsed and dried. The printed material exhibits marked improvement as to shade, as compared to material printed with a similar paste but containing no glycerol-di-tolyl ether.

Example III 40 The printing paste is prepared as follows:

Glycerol-di-o-tolyl' ether 8 50 Acetate silk material is printed with this paste, as in Example II, and shows marked improvements. 55

Example IV The composition of the printing paste is 'as follows:

Example II. I

The following example illustrates the method wherein the ,ether is incorporated in'-the dyestufi" paste, prior to the preparation of the printing paste.

Example V 210 parts of 1,4-di-methylamino-anthraquinone in paste form are mixed witlr 210 parts of glycerol di-orthotolylether emulsion (41%) and the mixture is evaporated on the water bath until the total weight is 230 parts. The composition so obtained can be used in printing pastes without the necessity of adding the ether separately.

It will be understood that many variations and modifications are possible in our preferred mode of operation, without departing from the spirit of this invention.

We claim:

1. In the process of printing cellulose ester material with water-insoluble dyestufis adapted to color the same, the improvement which comprises applying the dyestuif in the presence of an ether of a polyhydrogy alcohol selected from the group consisting of aryl ethers and aralkyl ethers.

2. In the process of printing cellulose ester material with water-insoluble dyestufis adapted to color the same, the improvement which comprises applying the dyestufi in the-presence of a diaryl ether of glycerine.

3. A printing paste comprising a water-insoluble dyestufi adapted to color cellulose acetate material and an assistant selected from the group consisting of aryl and aralkyl ethers of polyhydroxy alcohol.

4. A printing paste for cellulose acetate material comprising a water-insoluble dyestuff adapted to color cellulose acetate material and a diaryl ether of glycerine.

SIMON THOMSON MCQUEEN. ALEXANDER STEWART. 

